PDF malware analysis — malicious · 310b0a0b715c411a

MALICIOUS

PDF

89.7 KB Created: 2021-09-19 09:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: e45fc6c079c6b8daff7bb8b29fc8fa56 SHA-1: 5b3caed919375748f12a8963532b426145bbdb22 SHA-256: 310b0a0b715c411a8976e7ceea92aa9192ca34c5b8de1298e8fbe47da98fc05e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs indicate a strong phishing or scam attempt, likely aiming to lure victims to various disposable domains. The ClamAV detection further supports the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://wxhsbl.com/ckfinder/userfiles/files/20210914_170635.pdf In PDF document text
- http://lavalnerina.it/userfiles/file/dadimawipujabategob.pdfIn PDF document text
- https://aurorabersinar2.com/contents/files/leguzudozinarezon.pdfIn PDF document text
- https://www.tahitotfalu.hu/ckfinder/userfiles/files/16959553724.pdfIn PDF document text
- http://nissanotogovap.vn/uploads/images/files/zajabonigiva.pdfIn PDF document text
- http://choinka4x4.org/cms/files/file/bepuv.pdfIn PDF document text
- http://auroraenergyproject.it/userfiles/files/65985435796.pdfIn PDF document text
- http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/97496169384.pdfIn PDF document text
- https://www.hsbofmn.com/ckfinder/userfiles/files/pevifufugutojolabipulizuf.pdfIn PDF document text
- http://hferrynetworks.com/FileData/ckfinder/files/20210904_FFC47B1CE854817D.pdfIn PDF document text
- https://yumasri.com/assets/ckfinder/userfiles/files/vonakikud.pdfIn PDF document text
- http://madmojo.com/fckupload/file/ferozasi.pdfIn PDF document text
- https://yesilkoyluleriz.biz/resimler/files/nelijogimejujotav.pdfIn PDF document text
- https://dalycity.com/wysiwygfiles/file/50744674551.pdfIn PDF document text
- https://poulinstrapscan.com/userfiles/file/78119684089.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146ba665f046---wumadaxarekelonafegutobad.pdfIn PDF document text
- https://textosolutionslinguistiques.com/upload/editor/file/34611083719.pdfIn PDF document text
- https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/kabidupugufexukokevimuw.pdfIn PDF document text
- http://qhchemicalsfeed.com/upload/files/84654605272.pdfIn PDF document text
- http://www.uc-kushiro.net/images/library/File/80879204428.pdfIn PDF document text
- http://wangguanhardware.com/userfiles/file/nanofaxibilevigawawonunuk.pdfIn PDF document text
- https://birotex.rs/images/files/95816803862.pdfIn PDF document text
- http://orthocarecentroortopedico.it/userfiles/files/rafetepuvexuwitu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=black+templars+codex+pdfPDF link annotation
- https://www.thc.gda.pl/ckfinder/userfiles/files/21972162875.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f28f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF28F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010aa6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AA6	10832 bytes
SHA-256: `5aa461ded4ddd563680df1948f523471b0bd3d54055a52b076fd789071017bd1`
`font_02_sfnt_off000123be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123BE	20440 bytes
SHA-256: `6edbb39efdfa0c51da76701aa8599550cd941a72e800edd9895cdaac6dbb3098`

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